import esphome.codegen as cg
import esphome.config_validation as cv
from esphome.components import i2c, sensor
from esphome.const import CONF_BUS_VOLTAGE, CONF_CURRENT, CONF_ID, CONF_POWER, \
    CONF_SHUNT_RESISTANCE, CONF_SHUNT_VOLTAGE, ICON_FLASH, \
    UNIT_VOLT, UNIT_AMPERE, UNIT_WATT

DEPENDENCIES = ['i2c']

CONF_CHANNEL_1 = 'channel_1'
CONF_CHANNEL_2 = 'channel_2'
CONF_CHANNEL_3 = 'channel_3'

ina3221_ns = cg.esphome_ns.namespace('ina3221')
INA3221Component = ina3221_ns.class_('INA3221Component', cg.PollingComponent, i2c.I2CDevice)

INA3221_CHANNEL_SCHEMA = cv.Schema({
    cv.Optional(CONF_BUS_VOLTAGE): sensor.sensor_schema(UNIT_VOLT, ICON_FLASH, 2),
    cv.Optional(CONF_SHUNT_VOLTAGE): sensor.sensor_schema(UNIT_VOLT, ICON_FLASH, 2),
    cv.Optional(CONF_CURRENT): sensor.sensor_schema(UNIT_AMPERE, ICON_FLASH, 2),
    cv.Optional(CONF_POWER): sensor.sensor_schema(UNIT_WATT, ICON_FLASH, 2),
    cv.Optional(CONF_SHUNT_RESISTANCE, default=0.1): cv.All(cv.resistance,
                                                            cv.Range(min=0.0, max=32.0)),
})

CONFIG_SCHEMA = cv.Schema({
    cv.GenerateID(): cv.declare_id(INA3221Component),
    cv.Optional(CONF_CHANNEL_1): INA3221_CHANNEL_SCHEMA,
    cv.Optional(CONF_CHANNEL_2): INA3221_CHANNEL_SCHEMA,
    cv.Optional(CONF_CHANNEL_3): INA3221_CHANNEL_SCHEMA,
}).extend(cv.polling_component_schema('60s')).extend(i2c.i2c_device_schema(0x40))


def to_code(config):
    var = cg.new_Pvariable(config[CONF_ID])
    yield cg.register_component(var, config)
    yield i2c.register_i2c_device(var, config)

    for i, channel in enumerate([CONF_CHANNEL_1, CONF_CHANNEL_2, CONF_CHANNEL_3]):
        if channel not in config:
            continue
        conf = config[channel]
        if CONF_SHUNT_RESISTANCE in conf:
            cg.add(var.set_shunt_resistance(i, conf[CONF_SHUNT_RESISTANCE]))
        if CONF_BUS_VOLTAGE in conf:
            sens = yield sensor.new_sensor(conf[CONF_BUS_VOLTAGE])
            cg.add(var.set_bus_voltage_sensor(i, sens))
        if CONF_SHUNT_VOLTAGE in conf:
            sens = yield sensor.new_sensor(conf[CONF_SHUNT_VOLTAGE])
            cg.add(var.set_shunt_voltage_sensor(i, sens))
        if CONF_CURRENT in conf:
            sens = yield sensor.new_sensor(conf[CONF_CURRENT])
            cg.add(var.set_current_sensor(i, sens))
        if CONF_POWER in conf:
            sens = yield sensor.new_sensor(conf[CONF_POWER])
            cg.add(var.set_power_sensor(i, sens))
